Earthquake with magnitude of ML 0.4 on date 28-12-2021 and time 20:28:18 (UTC) in region 3 km E Preone (UD)

A magnitude ML 0.4 earthquake occured in region: 3 km E Preone (UD), on

  • 28-12-2021 20:28:18 (UTC)
  • 28-12-2021 21:28:18 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 46.3900, 12.9020 at 9 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Preone UD 3 246 246
Enemonzo UD 3 1319 1565
Villa Santina UD 4 2233 3798
Lauco UD 5 729 4527
Raveo UD 6 458 4985
Socchieve UD 6 908 5893
Verzegnis UD 7 863 6756
Ampezzo UD 9 1006 7762
Tolmezzo UD 9 10440 18202
Cavazzo Carnico UD 11 1052 19254
Ovaro UD 11 1922 21176
Tramonti di Sopra PN 12 321 21497
Zuglio UD 13 595 22092
Arta Terme UD 13 2171 24263
Tramonti di Sotto PN 14 387 24650
Comeglians UD 14 516 25166
Amaro UD 15 823 25989
Ravascletto UD 15 536 26525
Sutrio UD 15 1332 27857
Prato Carnico UD 17 904 28761
Cercivento UD 17 679 29440
Sauris UD 17 416 29856
Forni di Sotto UD 18 600 30456
Bordano UD 18 754 31210
Clauzetto PN 18 380 31590
Paluzza UD 18 2217 33807
Vito d'Asio PN 18 769 34576
Trasaghis UD 18 2227 36803
Rigolato UD 18 448 37251
Forgaria nel Friuli UD 19 1786 39037
Venzone UD 19 2117 41154
Treppo Carnico UD 19 618 41772

Municipalities with at least 50000 inhabitants

An earthquake occurred to
45 Km NW of Udine (99169 inhabitants)
52 Km NE of Pordenone (51229 inhabitants)
95 Km NE of Treviso (83731 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 0.4 2021-12-28
20:28:18
46.3897 12.9017 9 2021-12-28
20:37:40
Sala Sismica INGV-Roma 99087551
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-28 20:28:18 ± 0.27
Latitude 46.3897 ± 0.0054
Longitude 12.9017 ± 0.0091
Depth (km) 9 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 99087551

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 658
Semi-minor axis of confidence ellipse (meter) 130
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 245
Circular confidence region, given by single value of horizontal uncertainty (meter) 660.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 62
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.32
Epicentral distance of station closest to the epicenter (degree) 0.06835
Epicentral distance of station farthest from the epicenter (degree) 0.23292
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 99087551
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-28 20:37:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
OX.PLRO.HHZ. 2021-12-28T20:28:27.59 0.6 undecidable manual S 47 0.2329 110 -0.01 50
IV.FVI.HHE. 2021-12-28T20:28:26.75 0.3 undecidable manual S 338 0.2230 111 -0.5 67
OX.MPRI.HHZ. 2021-12-28T20:28:25.29 0.6 undecidable manual S 158 0.1601 118 0.25 48
IV.STAL.HHZ. 2021-12-28T20:28:25.92 0.6 undecidable manual S 226 0.1853 115 0.03 50
OX.BOO.HHE. 2021-12-28T20:28:24.14 0.3 undecidable manual S 117 0.1529 119 -0.65 64
NI.PALA.HHZ. 2021-12-28T20:28:24.79 0.6 undecidable manual S 174 0.1457 120 0.25 48
NI.PURA.HHE. 2021-12-28T20:28:23.30 0.6 undecidable manual S 288 0.1160 126 -0.29 48
IV.FVI.HHE. 2021-12-28T20:28:23.79 0.1 undecidable manual P 338 0.2230 111 0.42 91
OX.PLRO.HHZ. 2021-12-28T20:28:23.82 1.0 undecidable manual P 47 0.2329 110 0.25 24
IV.STAL.HHZ. 2021-12-28T20:28:22.44 0.1 undecidable manual P 226 0.1853 115 -0.15 98
OX.CLUD.HHZ. 2021-12-28T20:28:22.14 0.6 undecidable manual S 348 0.0683 141 -0.12 50
NI.PALA.HHZ. 2021-12-28T20:28:22.25 1.0 negative manual P 174 0.1457 120 0.44 23
OX.FUSE.HHZ. 2021-12-28T20:28:22.66 0.6 undecidable manual S 70 0.0728 139 0.29 48
OX.MPRI.HHZ. 2021-12-28T20:28:22.48 0.6 negative manual P 158 0.1601 118 0.38 47
OX.BOO.HHE. 2021-12-28T20:28:21.31 0.1 undecidable manual P 117 0.1529 119 -0.63 86
NI.PURA.HHE. 2021-12-28T20:28:21.16 0.1 undecidable manual P 288 0.1160 126 -0.1 100
OX.CLUD.HHZ. 2021-12-28T20:28:20.70 0.1 undecidable manual P 348 0.0683 141 0.22 98
OX.FUSE.HHZ. 2021-12-28T20:28:20.99 0.1 negative manual P 70 0.0728 139 0.45 94
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
OX.CLUD.HHE. ML:0.3 0.0000293 0.48 AML other m 2021-12-28T20:28:22.45
OX.CLUD.HHN. ML:0.3 0.000029699999999999997 0.7 AML other m 2021-12-28T20:28:22.22
OX.FUSE.HHE. ML:0.4 0.00003990000000000001 0.28 AML other m 2021-12-28T20:28:22.70
OX.FUSE.HHN. ML:0.6 0.00006075 1.3 AML other m 2021-12-28T20:28:23.73
OX.PLRO.HHN. ML:0.7 0.000029200000000000005 0.5 AML other m 2021-12-28T20:28:27.55
OX.PLRO.HHE. ML:0.6 0.00002625 1.22 AML other m 2021-12-28T20:28:28.81
OX.CLUD.HNE. ML:0.4 0.00003599255 0.4992 AML other m 2021-12-28T20:28:22.21
OX.CLUD.HNN. ML:0.3 0.000030512070000000003 0.2816 AML other m 2021-12-28T20:28:22.22
OX.FUSE.HNE. ML:0.2 0.00002567823 0.0768 AML other m 2021-12-28T20:28:22.84
OX.FUSE.HNN. ML:0.5 0.000051622195 0.1408 AML other m 2021-12-28T20:28:22.73
NI.PALA.HHE. ML:0.6 0.000037426975000000004 0.256 AML other m 2021-12-28T20:28:25.63
NI.PALA.HHN. ML:0.6 0.00004091291 0.1408 AML other m 2021-12-28T20:28:24.92
IV.STAL.HHE. ML:0.4 0.00001885296 0.2048 AML other m 2021-12-28T20:28:27.15
IV.STAL.HHN. ML:0.4 0.00001752596 0.1792 AML other m 2021-12-28T20:28:27.29
OX.MPRI.HHE. ML:0.2 0.000016182875 0.2432 AML other m 2021-12-28T20:28:25.75
OX.MPRI.HHN. ML:0.4 0.000018499399999999998 0.256 AML other m 2021-12-28T20:28:25.77
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, http://terremoti.ingv.it/tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download